Hi Everyone, I'm hoping someone more knowledgeable than myself can help me out. I have a 2006 Intel-based Mac Pro: Processor: Two 2.66GHz Dual-Core Intel Xeon processors Ram: 6GB (two 512MB) of 667MHz DDR2 ECC fully buffered DIMM HDD Bay 1: 250GB Serial ATA 3Gb/s; 7200 rpm; 8MB cache OSX: Tiger I need to upgrade to Snow Leopard to be able to use newer Leopard & above only versions of software ie FCP, Aperature, etc. The issue is that I would like to keep the Tiger OSX as I run Pro Tools LE 7 on it. Upgrading to Snow Leopard would render Pro Tools LE 7 incompatible and I would have to buy it again. So here's what I'm thinking. I would like to install a secondary HDD in Bay 2 and install Snow Leopard on it. Is it possible to have OSX Tiger on the HDD in Bay 1 and have OSX Snow Leopard on the HDD Bay 2? Could they each be a different startup to be selected via System Preferences or at bootup? I would only want to run one OS at any given time. If so what would be a workflow for installing the 2nd HDD and setting it up with OSX Snow Leopard. Also, compatible hard drives for the 2006 Intel Mac Pros seem to be harder to find now. I called Apple and they no longer sell any compatible internal HDDs. Can anyone confirm that this drive would be compatible? http://www.amazon.com/Western-Digital-WD5000KSRTL-WD5000AAKS-Caviar/dp/B000FBSREK/ref=cm_cr_pr_product_top I know it's alot to ask and I thank anyone in advance for any advice.